Bluetooth Low Energy (Bluetooth Smart) to RS-485 Gateway


Design files


Modbus is an application protocol for serial data transmission that often uses RS-485 for serial data transfer. This reference design implements a gateway between Modbus and the Bluetooth® Smart CC2540 wireless MCU. It serves as a replacement for wires in an RS-485 network, and it allows another Bluetooth® Smart-compatible device like a computer or smartphone to easily connect to an existing RS-485 network.

  • Implements wireless connection to industrial electronic devices with the CC2540T Bluetooth Smart Gateway solution graded up to 125°C
  • Simple and "ready to go" design shortens time to market
  • Android app (ModbusController) provided to enable control and communication with Modbus peripheral software
  • This design is tested and includes firmware, GUI, demo and user guide
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDU532.PDF (3413 K)

Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


Complete listing of design components, reference designators, and manufacturers/part numbers

TIDC715.ZIP (850 K)

Design file that contains information on physical board layer of design PCB


Includes TI products in the design and potential alternatives.

Low-power 2.4-GHz products

CC2540TExtended industrial temperature Bluetooth® Low Energy (LE) wireless MCU

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TPS769100-mA, 10-V, low-IQ, low-dropout voltage regulator with enable

Data sheet: PDF
RS-485 & RS-422 transceivers

SN65HVD485EHalf-Duplex RS-485 Transceiver

Data sheet: PDF | HTML

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Technical documentation

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Type Title Date
Design guide Bluetooth Smart to RS485 Gateway With Modbus Application Software Design Guide Feb. 18, 2014

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